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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08ad81712b73663d04577b96b5498bf0934166ed1c9548baca897251cedc1f66' 
  AND token = 'l+eKfUh/sB+hSIhlyNo4TApNk9y2e4AhUyQ1Xh5Q7J8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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