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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ba09b53ae8c100707361a7a53f8edd06bcf56f7475b896a7a10789fb72e6103' 
  AND token = 'xEZqYyUVmkUlXd+hRdrcOdqVgcbufkCyb1KEvEYweek=' 
  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"
    }
  }
}