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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c61744f3123d071dd77dffc299fecd4e12604fd9b22d2c77ec208e86acb4d464' 
  AND token = 'VDmaL9cZTd9Si73LmyW8RLCCTm9+8waBPV+9KP4gOmw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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