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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '25a58ae44479c090dd8ec74e82b7b31f01aa3e00f1f096230ab81e74f6b8d463' 
  AND token = 'bcH0PoFXoAaTEObiIuWbqH7HMTEmkJxeQQ9mr+c0VNo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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