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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0b30626b17bb68dfc2d8f9cf2c541165b593c69d5feff412b69a6c967bb673b' 
  AND token = 'h8d31BQTk0b56yTVU+NvI0VAR3Od1mTz3bC3oMb0uCM=' 
  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"
    }
  }
}