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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36220217a5ed4afb09e904516b9c1a546b997da661de8117517b206b64a99f5a' 
  AND token = '+b/ciqcfSAVDtTYD+G0glIG+BBnhugDTumZYF29MduM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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