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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '340b1bc9a9b694d2a32f2ced393d19a58d62586cda728741b612f93f5421e38e' 
  AND token = 'jjptFk/SPwURIrLBQIIiwAkKY8eBG/a0EYTb79OlfIs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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