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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00a4b41ef5ba1d9c3ab75a0cdebfbb50e47babcd1f477362534f26eda3e5ca6a' 
  AND token = 'Mgpinqwj5uok0LJ3wX30Z4Ob0y16PC1eN9Aj+xAUJQ4=' 
  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"
    }
  }
}