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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ab7f2311f6cce31588fd9c5ef3362b0b551ef66d3d84817b46dd9824215bd67' 
  AND token = 'oGo6bDvYD8F8E+WZ4yy6NHVov1sKUuFARYedgmAT0QQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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