SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c77b84986444d1683b0cf2a1e662da679fb463719f5541447bf156353ee10392' 
  AND token = 'Y9lNsBj1W2ghY7mxPD70PYI+b2L74mYG/G2Wz6rvACg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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