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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a10724c3b74f8911fefbf13a9af86eb1825273e1bd4f4e0efc0ec0b8eb4bf967' 
  AND token = 'N0LWXk43COl58WiB01whMb0G8E4Hmdvv5EbLVe8BZnk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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