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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db3cdb106011131df20559f9c750fef22b29a64404c7c54c017a070fc644d384' 
  AND token = 'az23Q7MUvxGgVyfxVZzqKsO8GF4tbywOmt8gM05xHb0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00059

JSON explain

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