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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff970d7e48118ff2a5b891f53d37b5795e337da5fbcb76b4e8dcc6b2500e3b3e' 
  AND token = 'mbitUIsZaIsZfa32pV6wFHpNmufeIzKxAtURxVma2JY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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