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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bbd6f3b59a2b5e1f1ec6675147bf43a9d29214324f6fb5c4ce561b2d36862c3b' 
  AND token = 'XUbV+fwZp21i9Qn8WoI8gogYLvbbU82qUHtge+dtENk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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