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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '80995616f3bd0546f49f0429674abbbe7e32a6a2e27c45d33242ba31d20522f0' 
  AND token = 'rdKqF92x1TZrrSEmBGsDZlNO1kJ2XRTOsqoS4zx+WlA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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