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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e1ea2de4ba2772737dec5c23014e61b96ca8ee1e0e5a4a53acc608fb5f8722d6' 
  AND token = 'U9LD4Wwl8B5QwqJ+Qz+VSOqrPyNXkrniynw5ryjstiM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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