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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1fcb2fe968a4f315369e4cb26d5b8d683c1f5f23b5bead69c0cc4561c7abda38' 
  AND token = 'qDwX9u/PhD9fWeYjUiKdaTHImeiAm9Lv0QbnYpvAGbs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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