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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96eb31b5b07b4a372e3193736599b739ccc5c89b41e476cf7effbb1e3cd43a9a' 
  AND token = 'o656nH15EHsqg7v4Qy0J6eY9tF8r9N/HPWIHrBEGxw4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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