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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7429617cc32af13f8d3d63daad91038d5d6fcd6015e662d7a5b097f2fed6babf' 
  AND token = 'zNgauEeTIz2JXm5iV/rdZMjmkDoB2z1zbeyx8JY3HCs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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