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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '647832417115eb0d98d2710cdbe6c5ba586c32d84ac53954dbda88f78ef1f1b6' 
  AND token = '/64yaWBhIdz8A+s9iIeORqplw1GlPE2Ddejvhqq/hFk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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