Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a5ab467e29a21905178ba62983e4ee0ac0c5fff08a5a7f0686ca639daf90f74' 
  AND token = '5Q8caF4qzO8XOdgY/c8doL48R22H8D249c3LPjEePCI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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