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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '50470fc85dbfae81abd2929ad59deee5602f245f04302643dcdeed155d9f1c45' 
  AND token = 'Ph4s6AC2sjtHT7YmDW8olZsStKkbuv/N9sI57IkyTt4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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