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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20a6f9402e6b60e2122ecfea3099b266593b0907ba79c320f06c9c6a19823b3c' 
  AND token = 'yXGs3Mp9sK6cuULHnbScPzLZMSWcKCLtW59drc5byNQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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