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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a4e52df4dccf9c3250acfb6d06dcc2ac8a53fd0c0a95b2488d34f7c3883f95b' 
  AND token = '5XhqdO4kWQMfXuUidw4vRvGy6tl0SQonMTaPInirQmc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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