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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5bb7823a60e1340c801ef9ce10401f376ae17cad2735d171ebc7a8f8d0de4249' 
  AND token = 'qhs5QaH4u4A/60lCJ56ZnxYgB9AWyaotyfOYMeYDOfA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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