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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7f2bfabe2d163068d9bc5996d97fc26296a64ccfc64e1c28e886892caf2d1c1' 
  AND token = 'Rahv+7g7hWJIpgUGWsGLBpSbaob+9ZqMDd3PyANLv8w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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