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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70cf47de8a58e24afdb6c8a76bf424bf0fb3f7b886a7cae6d999b64f3ec3f696' 
  AND token = 'Qbyp2HYwbOkYiaj/UxGTEE5tMktvG7MvrNES0nmXf6c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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