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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a7b075b6719ce1a6ecf56aa4e7143a57d58f62b3aa10a804466ec39a6495989' 
  AND token = 'Yne8Fh3fBQS4AUI24k7BaQmsxFJiW5cvlPTAhIBpU9Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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