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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '46c483863dfaf313d0af4cd32ad4e9e2c27bfce961d36cc0916871c838d6c4b1' 
  AND token = '28MUgA1HS7aPICrejktUPo00VddPxRX6LNn8E+aKBY8=' 
  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"
    }
  }
}