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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '267a92a5707529a9c82365b6dc4c6c2538808b993f5a88d56550ff24f1d0780f' 
  AND token = '2YViuhjndYw25SqbKHJ3S75iWXNewXu0lhOFpWU5YWI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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