Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd478a8756fe06cf3cd7b45e6cff0f23e321268781bb1b443e81ab29d81059cb7' 
  AND token = 'LFEy8+FvvOhmW7dL3OE3R3pSM2GEP3IMOc+3PumNyZ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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