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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca790316e66f63653eb5f0ca1a51d8e2c59fc686020f97bc2f85aac7350a06d5' 
  AND token = 'eD+t4ZEGMN3ABronB2i5eHR3o/7P/JQbPsOo8J1Fw3U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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