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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '056e0edd09ab643cd3e328e37517e8217a53da51dc87df6b5778fe3e2d679e17' 
  AND token = 'B6KjUIz1aoeUs3nS324KFvszY739MIouhrbx27klkSs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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