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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa41150a6feacdcec4106da6bdb843f8a2f5b0a9fad88916acbef2fc7a662f30' 
  AND token = 'ubQoLSGoWARh69+7ShzsqU0sdO/qbEEyGTCrZt1B+L4=' 
  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"
    }
  }
}