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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e10f8801afb7a355da7f42e8f04da982bf4d2bdbebd42c1dec620916156a98f' 
  AND token = 'bnoF9+7bEPlJzxpPitnvLPcuk7niV7S/KB8S/JGH8/4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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