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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0db83ed8328fc7b94b5cd6082413c0593a4dd733e90aa7eb9125e46d5696b233' 
  AND token = 'uyGZgcDS3o1w1eeX8oQUGCVBr1yi9WScI0fwaoEI/Qo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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