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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82f3b43afbc644d851df9e0d2625bfafba53f10d23d36f1ee8775e7ef6779a4c' 
  AND token = 'zyvvlkWDP5uB9m2DM6O0snEKu7yDVncNLRUKUUq45h8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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