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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df2c79effb765759e8f80661d1ebe3b21de1e4ed464499a781798139de04238c' 
  AND token = 'l0Fop1EuvoMht5R3ND/pbMP0V9Nz6OBnNnJhHRFOhsQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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