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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c58bd9f3a8414119ddbc805a590ae9791d71cc425331ad94b743ff01276b568' 
  AND token = 'KSWjmIMJRircDb6arUgwayNyKO8InZU/nP6FJjSbIN0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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