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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a81946b2710db18117a472ddc275ad9264596787c519adc08c680c37af3586ce' 
  AND token = '+hcf0ijI8Qz/S9AAkbfXVHvkuweBHclWlI4f469PYfo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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