Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a865b0c8b4484af58f6072c2c7f008919c29bc27033658eab6000f13e8f7a00' 
  AND token = 'JsI2f9UpMjvfbBvWucZ3VR1kN7Zhe7SPQuQBpepE3No=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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