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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4d306e5db941eb49c246a2f18a10111683e8c90bbf1050019b68f872f7b8c08a' 
  AND token = 'HCMaCBuGyd/h6l8/dRuvWoLkdIvscXRotPyJbspY/8w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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