SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1945b9486f21e4a71b861b29badffaa0598eb29936c4290c311f29c9e0d37307' 
  AND token = '+kzr+pXRhg7eQoHkTnYG4XIEijXMZqXkDXNfZLsK5YE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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