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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8050a5dee84462f4952ec7325dd9d5f0ef2414c11789cff9fd3b754b97c922bd' 
  AND token = '07aiK+h+AJthj5s9HZZL8xEQizj4dKm6MHSi7bv7OTU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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