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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '173f5558e339e0fecc25e769d520752796fdc45299826ea0d715789b4223b4c9' 
  AND token = 'jU9Tf2W1akKjv4lckAOZuYlO+3wZyXlTr+6VmWTTqTM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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