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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b663470ee39d79544e25f751098bb8eccac9fce2c8154b9a735aeed15c0aa759' 
  AND token = 'UtHzFiyhLF6Fji66jJF9tQoLmgkwTM9zex7d7FPjhRU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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