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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bbc0de60033b27772e6fe73a8dae7e180e1c5f67ba33568347e2f6b60a68a8da' 
  AND token = 'I4s6wpPD3MAPJegxfqhYfTO0w2V5uwI+43l/hk23T5A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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