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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4e35b9849c54ddd88dd84cfa5d712e1ff8a7228803d1fd1fa231156e9dfd6f49' 
  AND token = 'i/wOUSWY693ImWumghk2Q6kbrfLD2CDBtrhih7KytHc=' 
  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"
    }
  }
}