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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e8989344d42eec101d24310a854b1dec65b01aa9b049f4dedfca09c2063c989' 
  AND token = 'bGYn5TSx/7HyAbIY3A3l/O5SXuVcZGKcOHq8YeiZkos=' 
  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"
    }
  }
}