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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19edd1f415c6be8ed113ba1d7b4451f85dd7efb52ff8ddd335f93596c80a1efe' 
  AND token = 'gs+3y7itUGCCbWL3D311rsDKnC7V9S5RhmUNWkA/t/g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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