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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9c8846e208dfcf787f8127f80207fc00bf5fa0e190043774a9d1ef2292856be' 
  AND token = 'qI1T9IPd7fMw1C8EzRUM2N2RQV5Mb6EHB5lgMIUC6SY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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