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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56c39775a395b4776a60792e2c4e49387a9f104c78054c7c5674a90b717469af' 
  AND token = 'A1GODrhUl2oqjQe+yW8TdJYgRsVDP1K2aVzamk7Xoac=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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