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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2bb0708a271d4eaf926c389c692e57811c8bca4660a8c2ca784dd26fbf70b134' 
  AND token = 'nzIpzCJLgQE9kh511EpkiHlf23LlGS25e9z8fQa2EgE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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