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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31f4f17f008c9426f185a37850063e03e080c032f0bb229e63f0611394f3e3b3' 
  AND token = 'TtnOGlP6jw02GWtiZ3Fx1mNIM1gW1TOGpkhQBSIPd7Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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