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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e16316cca9b458f424fe2fcd71e6f56ddee8b934cc6a06b53a44e14ec77b4e79' 
  AND token = '5zc8n1syF17SPmqqqjRkaQiVsVpPTbSqhx+opPswDpg=' 
  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"
    }
  }
}