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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '057b72cbb77aadcda18b8a73a4048e98c12ec024a7dabf71d41722d01f0b784c' 
  AND token = 'VOaTt0wSaRn0Cx+c1bZ/f7s7yQ76EqU+pz7B01TowCY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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