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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf6a4580c9111e3d38472b7c052716b4928e4188adca542fed8f3130573351e9' 
  AND token = 'PmMkqahC1NKx6wYk/emk74HGmXDaPrdT7IPf5VcjA50=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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