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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71644843fad688f8827f8d3008e629829a2bf7b5682c4e454c7905f1a0cb2091' 
  AND token = 'Q6fjlBKs74aku3kud+9kjnc15decla4D1aP8D/9QM4E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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