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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b608b7a149944d0f48dbc85fd82b16062e297fd3766f1671ee876ff2200809fa' 
  AND token = 'KI2QB3ySP3Na/K38oBcccAvRQYkLlreGSNYbCnFVkso=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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