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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a671fd09a4abcb573d956a185cab7979a984118e32da8efc11ccd7042595b0d' 
  AND token = '9BSzhUd2lxwWbCd6WvbmgP7m+z3X3BEFB5U0dETmdRg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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