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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '439d1ee8ce65cf72b58841a7ee3f2b9190b8b7e63e3478283484a0d268c65474' 
  AND token = 'oRrkzFdI9FmiP7qNjxUjbbvSH/qAhbKCI4VCRH6PdkA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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