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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '387f95a5e96d71850363eaf64dc1e03b1ef2daa58a4c6af8803ce66fca75d611' 
  AND token = 'iziR7zKKte1qHL0AbPyl/jQXHJVfQ6FxdGKvtkPgjxA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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