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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c8dea268c22e89434767c73cc9fe780b2014eda0c373ec828ccfa83c85081cc6' 
  AND token = 'Bo5HNQh5C5vROkiCDdDY9lXWAwD8NrYD6k51mt39PiU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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