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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb09e2cc4d5c87514c62bc2225fa6510d059de7ae4edf8deb46af1fdc4ccc6de' 
  AND token = '7zdCQisWgkIO6rf2nekVIU47XGL5hVWEDY7fxLYAm0A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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