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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5990af4bb6ee3b5f29cb8426f771276eb0df5042b1c875f66ac601e83af017a2' 
  AND token = 'u/RUsSlR9eCu89fbiizsTT6Mn6z0zRfzBiG32kSugyc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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