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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e11f4b7ed8ccbb09ee33e9e68966a3734fe7e34e70443bf376572849b29f93e0' 
  AND token = '8mZYQGCsHDHHzkZ18YABHkqaps0V+zkny1zgAjcGp1E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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