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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '090996f968568380612dd26037e5ce21fac7a1be37fe092f06ff64e21551bbe7' 
  AND token = 'pbIgk9F5hbzMHXwxmye/UBDC20Rq5k/rE8VZxsU8BW4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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