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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71beddd470c2aa3b21f4adfd75e7dbc1a411243d5887a7f46e15b3c056595793' 
  AND token = 'gxZKq0Vyb9ICfCeP7wV3UbaNyJd5xONJqDg6pFUa2H4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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