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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d6be26c57139a3c726136a66d34e48942ee04f0a93b875aed72ea538df76120' 
  AND token = 'lLFP67ZB4eRApRpS0eyEKDx9+jnp5M78p1Yy7nje4SY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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