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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '261d368840abb25c12591d88143537c4450513ddaa2b8d4a1677de65881b1f1d' 
  AND token = '/Hhn5QptiTNErtnYdaEQ9dNjS4MiYIK5u6h0wT49A2I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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