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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4bb51073f52cda050617c157eb4b8d708378cbbdbbd7f1b8b3e279b844086a2a' 
  AND token = 'NZwh+BR9fxbTptpb9DTsvLjtOe9r736t0zZYowWuUMY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}