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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0494c7b02aaf3f728b40893f92e8c390a8674a0d646e72b43e19d9a2ec8e9bf6' 
  AND token = 'CBrczPynR+aD8V/rVffgFcU76ADqgQncRxtSVfPVxSs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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