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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6d1f6f515d5ed43b72a49b36a2382a3f9ae36122e369141c07cbb14bfeb526f' 
  AND token = '3zLotTxQu2AJhUF9yseF7ekBj2HEkECajjIVQ9C+k24=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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