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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7146eb58d97edb84998920ec94688e9402f7c0edf31e8d83dc870067256be141' 
  AND token = 'yMybQBYK/7+M/xL/P2CJtJg/RIAtoxPDluqQCmj2ILM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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