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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '991d234c5fd8a25a2d5839d8f7230a0d29fc2aee9bcf90add5c2f37cae985ec5' 
  AND token = 'jSfUCB+UMVOypBamkf8Ya4I1pGTKtKSPgshDSXdyemw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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