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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a17d6df16fa4aaeadf023d4e3a39322f2c821b3ce508f695b2f477446c2f5824' 
  AND token = '4xF2+wrhja8hMqHEbSpiTAqzNrQkddL+XE/LJ5RLebg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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