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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3cd1805fd535113038bd3ca16e817016577f12c26b1d601e32e0913ac8c65387' 
  AND token = 'xqTl/4Vzhv9s6gjpuKIfpvC/j536KIrNbnNHjBHVxTI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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